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WAN optimization is a collection of techniques for increasing data-transfer efficiencies across wide-area networks.

Techniques used:

Deduplication: The technique is used to improve storage utilization and can also be applied to network data transfers to reduce the number of bytes that must be sent across a link. In the deduplication process, unique chunks of data, or byte patterns, are identified and stored during a process of analysis. As the analysis continues, other chunks are compared to the stored copy and whenever a match occurs, the redundant chunk is replaced with a small reference that points to the stored chunk. Given that the same byte pattern may occur dozens, hundreds, or even thousands of times (the match frequency is dependent on the chunk size), the amount of data that must be stored or transferred can be greatly reduced.

SCA and BPEL – Rivals or Friends?

Sometimes, when talking about composite service-based applications, people get confused about the roles of SCA and of BPEL and consider that these two technologies are in conflict or that they are trying to perform the same roles. This isn’t the case – far from being rivals, SCA and BPEL are firm friends and are complementary parts of a business solution, each with its own role to play.

Putting this in another way, SCA is concerned with what components exist in the business application, what services those components offer, what service references those components depend on, how the components are connected together, what endpoint addresses and communication methods are used for the connections, what policies are applied to components and to the connections between them. BPEL is concerned with business logic and the sequences of operations which are performed to execute an individual business process. BPEL processes provide and consume other services through partnerLinks, but these are abstract interfaces that must be connected to actual endpoints and communication methods through configuration.

Clipper Portlets – A clipper portlet is a portlet that renders content from another web site. A clipper portlet can include all or a subset of another web site’s content using a process called “web clipping.” Clipper portlets are discussed in Creating Clipper Portlets.

Struts Portlets – Struts portlets are based on the Struts framework, which is an implementation of the Model-View-Controller (MVC) architecture.

Remote Portlets – WebLogic Portal’s remote portlets conform to the WSRP standard; they can be hosted within a producer application, and surfaced in a consumer application.

Postmodernism is a philosophical movement away from the viewpoint of modernism. More specifically it is a tendency in contemporary culture characterized by the problem of objective truth and inherent suspicion towards global cultural narrative or meta-narrative. It involves the belief that many, if not all, apparent realities are only social constructs, as they are subject to change inherent to time and place. It emphasizes the role of language, power relations, and motivations; in particular it attacks the use of sharp classifications such as male versus female, straight versus gay, white versus black, and imperial versus colonial. Rather, it holds realities to be plural and relative, and dependent on who the interested parties are and what their interests consist of. It upholds the belief that there is no absolute truth and the way in which different people perceive the world is subjective. It attempts to problematise modernist overconfidence, by drawing into sharp contrast the difference between how confident speakers are of their positions versus how confident they need to be to serve their supposed purposes. Postmodernism has influenced many cultural fields, including religion, literary criticism, sociology, linguistics, architecture, history, anthropology, visual arts, and music.